Duo-Therm controled furnace

[pulsarjab]

I need some help tracing issues with Atwood furnace. On a recent trip, it just quit. This is a 2000 Diplomat with a four button thermostat and the furnace has a Dinosaur control card. The thermostat has been reset and seems to be working with the Duo-Therm controller as I hear a click when the thermostat is turned on Furnace. On the furnace side, there is power to the 12 volt circuit breaker and if I bypass the relay, the fan will operate properly. The controller card has an led that is not lit and the furnace will not come on. Is there a good source for diagnosing the issues? I am open for all ideas and help.

Thanks for all the help I have gotten from this group over the years.

Greg

2000 Diplomat

 

[veraken]

Here's the Atwood service manual.  Hope it helps.

 

Atwood Furnace Manual.pdf